Lexus ES: Vehicle Speed Information Communication Lost (C2178)
DESCRIPTION
The tire pressure warning ECU and receiver receives signals from the combination meter assembly via CAN communication. If a malfunction occurs in this communication line, DTC C2178 is output.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| C2178 | Vehicle Speed Information Communication Lost | Communication between the combination meter assembly and tire pressure warning ECU and receiver is interrupted for 10 seconds or more. |
| - |
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
-
It is necessary to perform initialization
.gif)
after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.
PROCEDURE
| 1. | INSPECT COMBINATION METER ASSEMBLY (ON-VEHICLE INSPECTION) |
(a) Perform On-vehicle Inspection of the meter/gauge system.
Click here
HINT:
Check the meter function by referring to On-vehicle Inspection for the combination meter assembly.
| Result | Proceed to |
|---|---|
| Combination meter assembly is normal | A |
| Combination meter assembly is malfunctioning | B |
| A | .gif) | REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER |
| B | | GO TO METER / GAUGE SYSTEM |
READ NEXT:
Tire Pressure Monitor ECU Communication Stop (C2179)
DESCRIPTION The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line. DTC No. Detection Item DTC Detection Condition Troubl
Initialization Switch Error (for Test Diagnosis) (C2198)
DESCRIPTION The switch circuit inside the combination meter assembly turns on and off according to the steering pad switch assembly operation. During test mode, the tire pressure warning light blinks
Lost Communication with Brake System Control Module (U0129)
DESCRIPTION The tire pressure warning ECU and receiver receives signals from the skid control ECU (brake actuator assembly) via CAN communication system. DTC No. Detection Item DTC Detection Co
SEE MORE:
Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range (P0B231C)
DTC SUMMARY MALFUNCTION DESCRIPTION The hybrid vehicle control ECU detects a VB sensor malfunction. The cause of this malfunction may be one of the following: Battery voltage sensor VB sensor internal circuit malfunction
Battery voltage sensor malfunction
Communication (wire harness) malfunctio
Cooling Fan Circuit
DESCRIPTION The ECM calculates an appropriate cooling fan speed based on the engine coolant temperature, air conditioning switch status, refrigerant pressure, engine speed and vehicle speed, and sends a signal to the cooling fan ECU (fan with motor assembly). The cooling fan ECU (fan with motor asse
